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Lyudmil Tsvetkov

Joined: 12 Jun 2012
Posts: 5806

Post subject: Re: fortress_draw_rule    Posted: Thu Nov 24, 2016 11:37 am

Evert wrote:
Lyudmil Tsvetkov wrote:
[d]8/4n3/4k3/8/8/4K1B1/2B5/8 w - - 0 1

why instruct the engine above position is a draw, when SF finds mate very quickly even at bullet?

I'm not sure what point you think you're making?
The position is apparently mate in 43 moves (starting with 1. Bb3+), so the 50 move rule is irrelevant even if the knight is not captured (which I haven't checked). Source: Nalimov tables from http://www.k4it.de/?topic=egtb&lang=en.
If you're saying adjudicating a game deprives the engine of the ability to mishandle a position, or swindle it's opponent, sure. Different discussion though.

 Quote: score rises from 5 pawns to 48 pawns very quickly, SF has seen mate.

So why isn't it reporting a mate-score, then?

 Quote: what if SF has pruned above position, because its counter says 50-moves threshold, draw, to the benefit of this one

The position is not a 50 move draw, so if it had done that there's a bug to fix.
You also seem to confuse "pruning" with returning the known evaluation (and stopping the search) in tablebase positions.

I specifically said 'during the search', but you seem not to read.

above position could be encountered by the engine at depth 20 (43+10=53>50) during search, and the tbs will instruct it it needs 43 moves more to mate, going over the 50-move threshold, so it will conisder it as a draw.

as a result, the engine will lose half a point with no reason at all; by choosing the other node it goes for its 'best' move, which actually is suboptimal to the tbs position, and results only in a draw.

I guess you can do the maths such choices are also statistically relevant; they will always do a disservice to the stronger engine.
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Re: fortress_draw_rule Lyudmil Tsvetkov Thu Nov 24, 2016 11:37 am
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